Annealing-furnace.



Patented oct. 27, 1908.

ri. E. F. CREIGHTON. ANNEALING FUBNAGB.

APPLIOATION FILED PEB. 7, 190s.

ll'wentor` EImerE. FCreig'hton Att-5b Vtnesse@ ELMER E. F. CREIGHTON,

OF SCHENECTADY, NEW YORK, ASSIGNOR TO STANLEY G. I.

ELECTRIC MANUFACTURING COMPANY, A CORPORATION- OF NEW JERSEY.

ANNEALING-FURNACE.

To all whom 'it may concern:

Be it known that I, ELMER E. F. Climen-` ToN, a citizen of the UnitedStates, residing at Schenectady, county. of Schenectady, State of NewYork, have invented certain new and useful Improvements inAnnealing-Furnaces, of which the following is a specification. i

This invention relates to furnaces for annealing iron, and especiallylarge quantities of laminations of lron such as are used 1n building uptransformer cores. It is a mat- `ter of some difficulty tosecure auniform annealing of a pile of such laminations, owing to the unevendistribution of the heat in the furnace. \My invention aims toproducesuch a circulation ofthe hot gases as to effect a practically uniformheating of the iron.

The invention is shown in a somewhat diagrammatic manner in theaccompanying drawing, in which Figure l is a vertical cross section of afurnace built in accordance with my ideas; Fig. 2 is a top plan view ofa portion of the supporting platform; Fig. 3 is a top plan view lof thetruck or car on a larger scale; and Fig. 4 is an'end'view of the same.y

In the bottom of the furnace are two parallel grooves or troughs 1, inwhich are laid rails 2 to support and guide the ywheels 3 of a truckorcar 4, which is U-shaped in plan view in orderv to straddle theplatform or support 5 which rises from the floor of the furnace betweenthe rails. vided with four or more jacks 6, preferably hydraulic,-onwhich the bed or tray 7 is supwhich it can be jacks can be oppump 8connectported and by means of raised and lowered. The erated by a handor other ed with them by a iiexibl'e hose 9.

The sheets of iron to be annealed are assembled in apile 10` on the bed,and are then covered with a sheet-iron box or hood 11, which leaves aspace surrounding the pile of iron. The truck is then run' into thefurnace and the jacks are lowered until the bed rests on ythe platform.The jacks are then run down and'theltruck backed out, leaving the bedand its load in the furnace, as shown in Fig. 1.

A pipe 12 enters each side of the furnace, and air and. gas a...supplied to it vthrough the pipes 13 and 14 respectively.. The pipe 12 is coiled in the exhaust iue 15 of the fur- `Specication 'of LettersPatent.

Application filed February 7, 1906. Serial 110,299,940.

The truck is prohunted oet.' 27, 190s.

nace and then terminates in a nozzle 16 aimed toward the bottom of theoven, which is preferably somewhat lower than t-he platform 5.Transverse channels 17 are formed across the platform, and from eachchannel a down-{iue 1-8. leads to an exhaust flue .19,

controlled by a damper 20, or otherwise. The exhaust flues 15 lead tostacks 21, which can be provided with dampers 22 while`l auxiliaryexhaust fiues 26 connect flue 19 with the stacks 21. Y

In order to properly direct the inflowing jet of flame from the nozzle,the furnace may have a false bottom 23, vertically and angularlyadjustable in any suitable manner, as by means of a prop 24 placed underits inner end. Or, if preferred, the nozzle may be hinged, as shown at25, so that it can be turned to the proper angle to deliver the fiamewher'e it will be most effective.

The flame and 4hot gases first strike the lower part of the box and risealong its sides to the top ofthe furnace, where they turn 'outwardly andflowI down the walls of thev furnace to'the flues 15. A portiony of theiame and hot gases passes under the bed and out lthrough the flue 19,the amount dependin ron the position of the damper 20.` Insi e .the box,the air at the bottom is heated the hottest by the `flame impinging onthe outside of the box at that point, and circulates up the sides ofthebox and down along the sides of the ile of iron, as clearly shown by thelines an arrows.

With a furnace using a side-fiame there is a tendency to overheat thematerial at the top of the ile, while with a jet of flame playing on theottom of the pile the iron there will be overheated. With my arrangementthe tem erature at all points of the pile may easi y be made and keptuniform.

What I claim as new, vand desire to secure by Letters Patent of theUnited States, is,-

1. In an annealing furnace-the comblnation with aheating chamber, of asupport mounted in said chamber to carry the material to be annealed,said support having passages opening into said chamber at' the sides ofsald sup ort, and heaters mounted to direct part of) the heated gases aamst the sides of said support and art o said gases into the open endsof s a1 passages.

2. In an annealing furnace the combination witha heating chamber, of asupport mountedvin said chamber to carry the material to be annealed andhaving passages opening into said chamber, heaters mounted to directheated gases against said support and into the passages, an exhaust fluefor said chamber, and an independent exhaust flue connected to saidpassages.

3. In an annealing furnace the combination with a heating chamber, of asupport mounted in said chamber to carry the material to be annealed andhaving passages opening into said chamber, heaters mounted to directheated gases against said support and into said passages, independentexhaust flues connected to said chamber and to said passages, and adamper mounted in one of said lues to control the flow of gases throughit.

4. In an annealing furnace, the combination with a heating chamber, ofheaters for directing heated gases away from the walls and toward thebottom of the chamber, and exhaust ues opening into the chamber near thelower edge of the walls thereof.

' 5. In an annealing furnace, the combination with a heating chamber, ofheaters for directing heated gases away from the walls and toward thebottom of the chamber, adjustable means for controlling the direction offlow of the gases, and exhaust flues opening into the chamber near thelower edge of the walls thereof.l v

6. In an annealing furnace, the combination with a heating chamber, of asupport.

having open-ended passages therein mounted near the bottom of saidchamber to carry the material to be annealed, exhaust fluescommunicating with the passages, exhaust fines opening into the chambernear Athe lower edge of the walls thereof, -and heaters in said chamberfor directing heated gases away from the walls over said support andinto said passages.

7 In an annealing furnace, the combination with a heating chamber, of asupport having` open-ended passa es therein mounted near the bottom ofsai chamber to carry the material to be annealed, exhaust iluescommunicating with the passages, yexhaust Hues opening into the chambernear thel lower edge of the walls thereof, heaters for directing heatedgases over said support and into saidpassages, and dampcrs controllingsaid exhaust flues.

8. In an annealing furnace the combination with a vheating chamber, of aflat support mounted near the bottom of said chamber, a removable bedcarried by said support, a removable cover arranged to coperate withsaid bed to form a closed annealing chamber, said support havingpassages therein opening into said heating chamber at the edge of thesupport, and heaters mounted to direct heated gases against the edge ofsaid support and into said passages.

9. In an annealing furnace the combination with a heating chamber, of asupport having open-ended passages therein mounted near the bottom ofsaid chamber, a removable cover arranged to coperate with said supportto form a closed annealing chamber, heaters mounted to direct heatedgases against the lower edge of said annealing chamber and into saidpassages, an exhaust flue communicating with said passages, and anexhaust iuelopening into said heating chamber near the lower edge of thewalls thereof.

In witness whereof I have hereunto set my hand this 6th day of February,1906.

ELMER E. F. CREIGHTON. Witnesses:

BENJAMIN B. HULL, HELEN ORFoRD. i

